1 / 13

DWR Method 4 Proposal II

DWR Method 4 Proposal II. Peter Brostrom Urban Water Conservation Manager California Department of Water Resources Water Use and Efficiency Branch. Proposed Method divides urban water use into 3 sectors: Residential CII landscape/water loss. Indoor Residential Savings.

jacoba
Download Presentation

DWR Method 4 Proposal II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. DWR Method 4 Proposal II Peter Brostrom Urban Water Conservation Manager California Department of Water Resources Water Use and Efficiency Branch

  2. Proposed Method divides urban water use into 3 sectors: Residential CIIlandscape/water loss

  3. Indoor Residential Savings • Residential Savings uses the method two indoor residential performance standard of 55 GPCD. • State average based on Public Water Service Survey (PWSS) data equals 69 GPCD • 69 GPCD-55 GPCD = 14 GPCD statewide savings from indoor Residential

  4. CII Savings • Uses the Method II CII savings goal of a 10% reduction • 20x2020 Report estimated statewide CII use at 37 GPCD • Statewide savings of 3.7 or 4 GPCD

  5. Landscape and Water loss Savings • Since statewide landscape area and landscape water use is unknown, statewide savings standards can be developed directly. • Landscape savings estimated indirectly by subtracting indoor residential savings and CII savings from the total statewide savings goal (38 GPCD). • 38-14 (IR)- 4 (CII)= 20 GPCD statewide savings from landscape

  6. Landscape Savings % • A percentage reduction is calculated by dividing the 20 GPCD statewide savings estimate by state total landscape and water loss use. • Landscape/water loss Statewide Total Use: 192-69-37= 86 GPCD Statewide Landscape savings goal: 23 GPCD/86 GPCD = 23.5%

  7. Statewide Savings Estimate • If state average indoor residential is 69 GPCD • And every supplier: • Reduces indoor residential use to 55 GPCD • Reduces CII by 10% • Reduces landscape and water loss by 23.5 % • The state will meet the 20% reduction goal in GPCD

  8. Retail Water Supplier Target • Suppliers set water use target using individual agency numbers and the 3 state standards • Example: A Supplier with baseline per capita water use of 160, indoor residential of 65 and CII water use of 50 GPCD • Indoor Residential 65-55= 10 GPCD • CII (50)10%= 5 GPCD • Total Landscape/Water Loss 160-65-50=45 GPCD, • Landscape/Water Loss (45) 23.5%= 11 GPCD • 10 +5+ 11=26 GPCD savings target or a 16% reduction

  9. Example Target Calculation: (66-55)+(30 x0.1)+(104x 0.235) 11 + 3 + 24.4 =38.4 Percent Reduction: 38.4/200=19.2%

  10. Adjustment for Winter Irrigation • Last meeting, DWR presented an adjustment based on dedicated landscape meters which didn’t work on a statewide basis. • Revised approach uses difference between summer and winter water use and irrigation requirements.

  11. Irrigation Adjustment Factor Winter Meter Readings (Wmr) =Indoor Residential(IR) + Winter Irrigation (WI) Summer Meter Readings (Smr) = Indoor Residential(IR) + Irrigation Requirement Factor(F) x Winter Irrigation (WI)

  12. Summer –Winter Use • Equation: Smr-Wmr=(IR+(f)WI)-(IR+WI) =(f)WI-WI =WI(f-1) WI= Smr-Wmr/(f-1)

  13. Irrigation Requirement Factor F= 0.7ETos/(0.7ETow-0.25Precip) Example: City of Davis ETosETow EP J/F P Factor 0.7(7.7)/(0.7*1.5-0.25*3.5)=13.5

More Related